Cemented filling method and equipment for utilizing phosphogypsum pretreated by calcium oxide and slag

Abstract

The invention belongs to the technical field of ardealite filling, particularly relates to a calcium oxide pretreated ardealite and slag utilization cemented filling method and equipment, and provides the following scheme aiming at the existing problem that secondary pollution is easy to occur: the equipment comprises a stirring box, a recycling box is fixedly arranged below the stirring box and is used for collecting precipitated supernatant, and the recycling box is used for recycling calcium oxide pretreated ardealite; a base is arranged on one side of the stirring box, a fixing column is fixed to the top of the base, the outer wall of the fixing column is rotationally sleeved with a rotating disc, and a preparation box is fixed to the top end of the fixing column. In addition, after the homogeneous cemented filling slurry is prepared, the cemented filling slurry can be formed and cured on the same equipment, and the use is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of phosphogypsum filling, and in particular to a cementing filling method and equipment using phosphogypsum pretreated with calcium oxide and slag. Background Art

[0002] Phosphogypsum is a large amount of industrial byproduct produced during the production of phosphoric acid. Every ton of phosphoric acid produced will produce about 4 to 6 tons of phosphogypsum. Since phosphogypsum contains a certain amount of soluble fluorine (F), phosphorus (P) and other impurities, direct storage not only occupies a large amount of land, but also may cause environmental pollution, such as fluorine pollution of groundwater. Therefore, how to effectively treat and utilize phosphogypsum is an urgent problem to be solved.

[0003] At present, the treatment and utilization methods of phosphogypsum mainly include the following:

[0004] Building materials: Phosphogypsum is used to produce building materials such as building plaster, gypsum board and gypsum bricks. However, the market demand for these products is limited, making it difficult to consume phosphogypsum on a large scale.

[0005] Agricultural fertilizer: After proper treatment, phosphogypsum can be used as a soil conditioner and fertilizer additive. However, its use is limited by seasonal and geographical conditions.

[0006] Mine filling: Phosphogypsum is used to prepare cemented filling bodies for filling treatment of mine goafs. This method can not only effectively consume phosphogypsum, but also solve the problem of surface subsidence in mines. However, ordinary silicate cement is currently mainly used, which has poor bonding performance with phosphogypsum, resulting in unsatisfactory strength and stability of the filling body.

[0007] In the prior art, the following deficiencies still exist in the process of preparing high-performance cemented filling bodies:

[0008] The soluble fluorine and phosphorus elements remaining in phosphogypsum may leach out during use, causing secondary pollution. At the same time, the existing treatment process is relatively complex and costly, making it difficult to promote on a large scale. Therefore, a new treatment method is urgently needed that can effectively remove harmful components in phosphogypsum and economically and efficiently prepare high-performance cementitious fillings.

[0009] In view of the above problems, the present invention document proposes a cementing filling method and equipment for utilizing calcium oxide pre-treated phosphogypsum and slag. Summary of the invention

[0010] The purpose of the present invention is to solve the shortcomings of the existing easy secondary pollution and the need to use additional equipment to test the compressive strength of the cementitious filling body, and to propose a cementitious filling method and equipment using calcium oxide pretreated phosphogypsum and slag.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] The cementing filling method of calcium oxide pre-treated phosphogypsum and slag comprises the following steps:

[0013] S1. Select phosphogypsum after sufficient pressure filtration and test its moisture content, pH value and quality;

[0014] S2, preparing APAM flocculant into a 0.5‰ solution;

[0015] S3, mixing phosphogypsum and calcium oxide in a thickening device at a mass ratio of 1:1 to remove harmful components in the phosphogypsum;

[0016] S4, adding APAM solution to the preparation equipment to accelerate flocculation and sedimentation and remove harmful components of phosphogypsum in step S3, and separating the supernatant and the high-concentration phosphogypsum;

[0017] S5. In a preparation device, high-concentration phosphogypsum is mixed with deionized water and slag, and stirred evenly to prepare a homogeneous cementitious filling slurry;

[0018] S6. Perform compressive strength test on the molded cemented filling body in the preparation equipment.

[0019] In a possible design, the pH value of the phosphogypsum is 2-4, and the mass ratio of calcium oxide to phosphogypsum is 1:1-2.

[0020] In a possible design, the calcium oxide alkali washing pretreatment time is at least 10 minutes, and the rotation speed is at least 200r / min;

[0021] The mass ratio of the slag to the phosphogypsum is 1:6 to 1:8;

[0022] The mass concentration of the homogeneous filling slurry is 64% to 68%, and the density is 2.2 to 2.5 g / cm 3 .

[0023] Specifically, the present invention is achieved by the following steps:

[0024] Calcium oxide pretreatment: Phosphogypsum and calcium oxide are mixed in a certain proportion and pretreated with alkaline washing. Calcium oxide can react with the soluble fluorine and phosphorus elements in phosphogypsum to form insoluble calcium fluoride and calcium phosphate, thereby effectively removing harmful components in phosphogypsum.

[0025] Flocculation and sedimentation: Adding APAM flocculant to the pretreated phosphogypsum slurry can accelerate the flocculation and sedimentation process, allowing the phosphogypsum particles to settle and separate quickly, thereby improving the treatment efficiency.

[0026] Slag blending: Pre-treated and flocculated phosphogypsum is mixed with slag in a certain proportion to prepare a homogeneous cementitious filling slurry. As a low-cost, high-performance alternative material, slag not only reduces production costs, but also improves the strength and durability of the filling body.

[0027] Backfill preparation: The prepared cemented backfill slurry is molded and solidified to form a high-strength, low-pollution cemented backfill body for use in filling treatment of mine goaf areas.

[0028] Through the above method, the present invention not only effectively removes the soluble fluorine and phosphorus elements in phosphogypsum, avoiding secondary pollution, but also utilizes industrial waste slag, reduces production costs, and significantly improves the mechanical properties and durability of the filling body. Experimental results show that the cemented filling body prepared by the method of the present invention has excellent compressive strength and long-term stability, and is an environmentally friendly material with broad application prospects.

[0029] The specific steps of the invention are:

[0030] (1) Select phosphogypsum with a certain moisture content after sufficient filtration during the phosphoric acid production process, use a rapid moisture detector to test the moisture content of the phosphogypsum, and measure its pH and quality at the same time;

[0031] (2) taking some granular APAM flocculants, adding deionized water and using a magnetic stirrer to prepare an APAM solution with a mass fraction of 0.5‰;

[0032] (3) uniformly mixing phosphogypsum and a number of flaky calcium oxide in a certain proportion in a small thickening device;

[0033] (4) Add a certain amount of APAM solution to the small-scale thickening equipment to accelerate the flocculation, sedimentation and concentration of phosphogypsum. After standing for 5 to 10 minutes, use the overflow valve and the underflow discharge port to separate the supernatant and the high-concentration phosphogypsum.

[0034] (5) After testing the moisture content of high-concentration phosphogypsum, add a certain amount of deionized water and slag, and stir evenly to obtain the required homogeneous cementitious filling slurry.

[0035] (6) Uniaxial compressive strength tests were performed on the test blocks at 3 days, 7 days and 28 days after the homogeneous cementitious filling slurry was molded. Three blocks were selected at each age and the average value was taken as the compressive strength of the test blocks at that age.

[0036] A preparation device for preparing a cemented filling body and testing its compressive strength in the above-mentioned cemented filling method using calcium oxide pretreated phosphogypsum and slag, comprising a mixing box, a recovery box is fixedly provided below the mixing box for collecting the supernatant after precipitation, a base is provided on one side of the mixing box, a fixed column is fixed on the top of the base, a rotating disk is rotatably sleeved on the outer wall of the fixed column, and a preparation box is fixed on the top of the fixed column for mixing high-concentration phosphogypsum with deionized water and slag to form a homogeneous cemented filling slurry;

[0037] It also includes a preparation cylinder placed in the preparation box, a pressure sensor is fixed at the bottom of the preparation cylinder, and the pressure sensor is fixedly embedded in the bottom inner wall of the preparation box, and the pressure sensor and the preparation cylinder are used to weigh the mass of the high-concentration phosphogypsum;

[0038] It also includes a plurality of forming grooves arranged on the top of the rotating disk, which are used to shape and solidify the homogeneous cementing filling slurry in the forming grooves to form a high-strength, low-pollution cementing filling body. An impact block is provided below the preparation box to test the compressive strength of the cementing filling body;

[0039] It also includes a second stirring shaft that rotates and penetrates the preparation box, the bottom end of the second stirring shaft rotates and extends into the preparation box, and is used to stir the high-concentration phosphogypsum mixed with deionized water and slag, and the outer wall fixed sleeve of the second stirring shaft is provided with a first cam located above the preparation box;

[0040] A separation structure, arranged between the mixing tank and the recovery tank, for separating the supernatant in the mixing tank from the high-concentration phosphogypsum;

[0041] A filling structure, disposed in the preparation box, for uniformly filling the cementing filling slurry in the forming groove;

[0042] The test structure is arranged on one side of the preparation box and is used to perform a compressive strength test on the cemented filling body in the forming groove.

[0043] In a possible design, the separation structure includes a fixed tube fixed on the top of the recovery box, and the bottom end of the fixed tube extends into the recovery box, a drain pipe is slidably connected in the fixed tube, and the top end of the drain pipe is sealed and slidably extended into the mixing box, the outer wall of the fixed tube is provided with a thread, and the outer wall thread sleeve of the fixed tube is provided with a threaded sleeve, and the threaded sleeve is rotatably arranged on the outer wall of the drain pipe, and the cooperation between the threaded sleeve and the fixed tube is used to control the lifting and lowering of the drain pipe, a first discharge pipe is fixed on the top of the recovery box, and the bottom end of the first discharge pipe extends into the recovery box, a discharge barrel is provided on the top of the first discharge pipe, and the top end of the discharge barrel is fixedly extended into the mixing box, an inclined screen plate is slidably provided in the first discharge pipe for filtering high-concentration phosphogypsum, and a material guide pipe is fixedly penetrated on one side of the first discharge pipe , and one end of the guide pipe is located above the inclined screen plate, and the other end of the guide pipe is fixedly extended into the preparation box and cooperates with the preparation barrel, a sloped baffle is fixed on one side of the first discharge pipe, and the sloped baffle is located above the guide pipe, which is used to prevent liquid from entering the preparation box through the guide pipe, and a first stirring shaft is connected to the mixing box in a longitudinally rotatable manner; the threaded sleeve is rotated, and the threaded connection between the threaded sleeve and the fixed pipe can control the lifting and lowering of the discharge pipe, and the valve on the discharge pipe is opened, so that the supernatant above the high-concentration phosphogypsum can be quickly discharged into the recovery box, and then the valve on the discharge barrel is opened, and the high-concentration phosphogypsum in the mixing box enters the first discharge pipe through the discharge barrel, and the inclined screen plate filters the high-concentration phosphogypsum, filters the liquid contained therein, and the high-concentration phosphogypsum enters the preparation barrel through the guide pipe.

[0044] In a possible design, the filling structure includes a second discharge pipe that slides through the inner wall of the bottom of the preparation box, the top of the second discharge pipe is fixedly extended into the preparation tube and is connected to the preparation tube, and the second discharge pipe is used to inject bonding filling slurry into the forming groove, a gear ring is fixed on the top of the rotating disk, a driving motor is fixed on one side of the fixed column, and a spur gear meshed with the gear ring is fixed on the output shaft of the driving motor, which is used to drive multiple forming grooves to move in sequence to the bottom of the second discharge pipe, support columns are fixed on both sides of the top of the base, and the top of the support column touches the bottom of the rotating disk for supporting the rotating disk, and knocking cylinders for knocking the rotating disk are slidably connected in the two support columns, and a movable plate is slidably connected to the top of the base, one end of the movable plate sequentially penetrates the supporting column and the fixed column, and a plurality of arc plates are fixed on the top of the movable plate, and the bottom of the knocking cylinder is frustum-shaped, and the arc plate is used to drive the knocking cylinder to move upward, and a fixed seat is fixed on the top of the preparation box, and the fixed seat has a fixed seat inside An L-shaped rod is slidably penetrated, and the bottom end of the L-shaped rod is fixedly connected to the top of one side of the moving plate for driving the moving plate to move. A push plate is fixed to the side end of the L-shaped rod, and the push plate is slidably arranged on the top of the preparation box, a spring is fixed between the push plate and the fixed seat, and the spring is sleeved on the outer wall of the L-shaped rod for resetting the push plate, and the first cam, the spring and the push plate cooperate to drive the push plate to move back and forth, and a plurality of second stops for limiting the push plate are fixed on the top of the preparation box; the valve on the second discharge pipe is opened, and the slurry in the preparation cylinder falls into the forming groove, and then the motor drives the second stirring shaft and the first cam to rotate, and the convex part of the first cam cooperates with the spring to drive the push plate, the L-shaped rod and the moving plate to move back and forth in a straight line, and when the moving plate drives the arc plate to move, the arc plate cooperates with the knocking cylinder to continuously knock the rotating disk, so that the slurry falling into the forming groove is evenly distributed in the forming groove, and at the same time, the rotating disk is driven to rotate by the cooperation of the driving motor, the spur gear and the gear ring, so that the slurry can be injected into multiple forming grooves.

[0045] In one possible design, the test structure includes a lifting plate slidably arranged on one side of a preparation box, the bottom end of the lifting plate is fixedly connected to the top of the impact block, the lifting plate and the falling of the impact block are used to knock the cementitious filling body in the forming groove, the top of the preparation box is slidably connected with an arc block, and the arc block cooperates with a first cam, the top of the arc block and one side of the lifting plate are rotatably connected with the same connecting rod through a hinge shaft, the cooperation between the arc block and the connecting rod is used to drive the lifting plate to move up, a plurality of placement boxes are fixed on one side of the lifting plate for controlling the force of the impact block on the cementitious filling body, and the top of the preparation box is fixed with a first stopper for limiting the arc block; the second stirring shaft drives the first cam to rotate, the first cam pushes the arc block to move outward, and the arc block drives the lifting plate to move up through the connecting rod, thereby controlling the impact block to move up and down.

[0046] In a possible design, the top of the preparation box is slidably connected with an arc-shaped baffle, a first slot is provided on the side of the arc block close to the arc-shaped baffle, and a second slot is provided on the side of the push plate close to the arc-shaped baffle. Both sides of the arc-shaped baffle are respectively engaged with the first slot and the second slot for braking the arc block and the push plate respectively.

[0047] In one possible design, a hopper for injecting raw materials is provided on the top of the mixing box and one side of the preparation box, valves are provided on the outer walls of the second discharge pipe, the liquid discharge pipe and the discharge barrel, an inclined panel is fixed to the bottom inner wall of the mixing box for conveying the precipitated phosphogypsum particles toward the discharge barrel, and transparent glass is provided on one side of the mixing box for checking the liquid level of the supernatant.

[0048] In a possible design, a rotating shaft located below the inclined screen plate is rotatably connected in the first discharge pipe, and a second cam for driving the inclined screen plate to move up and down is provided on the outer wall fixed sleeve of the rotating shaft, one end of the rotating shaft is rotatably extended to one side of the first discharge pipe and is fixed with a second bevel gear, a transmission shaft is rotatably connected between the bottom of the mixing box and the top of the recovery box, and the top end of the transmission shaft is sealed and rotatably extended into the mixing box and is fixedly connected to the bottom end of the first mixing shaft, and a first bevel gear meshed with the second bevel gear is provided on the outer wall fixed sleeve of the transmission shaft; when the high-concentration phosphogypsum enters the first discharge pipe, the first mixing shaft drives the transmission shaft to rotate, and the transmission shaft drives the second cam to rotate through the meshing of the first bevel gear and the second bevel gear, and the second cam can continuously knock on the inclined screen plate, so as to remove the moisture contained in the high-concentration phosphogypsum on the inclined screen plate.

[0049] Beneficial effects: In the present invention, phosphogypsum and calcium oxide are uniformly stirred in a thickening device at a mass ratio of 1:1 to remove harmful components in the phosphogypsum; phosphogypsum and calcium oxide are mixed in a certain proportion and subjected to alkaline washing pretreatment. Calcium oxide can react with soluble fluorine and phosphorus elements in phosphogypsum to form insoluble calcium fluoride and calcium phosphate, thereby effectively removing harmful components in the phosphogypsum;

[0050] In the present invention, a knocking cylinder is slidably connected in each of the two support columns, a movable plate is slidably connected to the top of the base, a plurality of arc-shaped plates are fixed on the top of the movable plate, an L-shaped rod is slidably passed through the fixed seat, the bottom end of the L-shaped rod is fixedly connected to the top of one side of the movable plate, and a push plate is fixed to the side end of the L-shaped rod; the second stirring shaft drives the first cam to rotate, and the cooperation between the protruding part of the first cam and the spring drives the push plate, the L-shaped rod and the movable plate to move reciprocatingly in a straight line, and the cooperation between the arc-shaped plate and the knocking cylinder continuously knocks the rotating disk, so as to make the slurry falling into the forming trough evenly distributed in the forming trough.

[0051] In the present invention, by mixing phosphogypsum and calcium oxide in a certain proportion and performing alkali washing pretreatment, harmful components in the phosphogypsum can be effectively removed. In addition, after preparing the homogeneous cementitious filling slurry, the cementitious filling slurry can be formed and solidified on the same equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic diagram of the three-dimensional structure of a preparation device provided by the present invention;

[0053] Figure 2 A schematic diagram of a front cross-sectional structure of a preparation device provided by the present invention;

[0054] Figure 3 A schematic diagram of a three-dimensional cross-sectional structure of an inclined plate and a threaded sleeve of a preparation device provided by the present invention;

[0055] Figure 4 A schematic diagram of a partial three-dimensional cross-sectional structure of a discharge barrel and a first discharge pipe of a preparation device provided by the present invention;

[0056] Figure 5 A three-dimensional cross-sectional structural schematic diagram of a preparation box and a rotating disk of a preparation device provided by the present invention;

[0057] Figure 6 A schematic diagram of a three-dimensional exploded structure of a base and a rotating disk of a preparation device provided by the present invention;

[0058] Figure 7 A schematic diagram of the three-dimensional structure of a preparation box of a preparation device provided by the present invention;

[0059] Figure 8 A schematic diagram of a three-dimensional explosion structure of a preparation box, an arc-shaped baffle and a placement box of a preparation equipment provided by the present invention;

[0060] Fig. 9 A schematic diagram of a three-dimensional cross-sectional structure of a support column and a knocking cylinder of a preparation device provided by the present invention;

[0061] Fig.10 This is a partial three-dimensional cross-sectional structural schematic diagram of a first discharge pipe and a discharge barrel of a preparation equipment provided by the present invention.

[0062] In the figure: 1, mixing box; 2, recovery box; 3, preparation box; 4, base; 5, fixed column; 6, rotating disk; 7, forming groove; 8, guide pipe; 9, first mixing shaft; 10, transparent glass; 11, inclined plate; 12, discharge pipe; 13, fixed pipe; 14, threaded sleeve; 15, discharge barrel; 16, first discharge pipe; 17, inclined baffle; 18, inclined screen plate; 19, preparation barrel; 20, pressure sensor; 21, second mixing shaft; 22, second discharge pipe; 23, drive motor; 24, spur gear; 25, Gear ring; 26, first cam; 27, fixed seat; 28, push plate; 29, L-shaped rod; 30, spring; 31, movable plate; 32, support column; 33, knocking cylinder; 34, arc plate; 35, arc block; 36, connecting rod; 37, lifting plate; 38, placement box; 39, impact block; 40, arc baffle; 41, first slot; 42, second slot; 43, first block; 44, second block; 45, rotating shaft; 46, second cam; 47, transmission shaft; 48, first bevel gear; 49, second bevel gear. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0064] Embodiment 1: A cementing filling method using calcium oxide pretreated phosphogypsum and slag, comprising the following steps:

[0065] (1) Phosphogypsum with a certain moisture content after sufficient filtration during the phosphoric acid production process was selected, the moisture content, mass and pH of the phosphogypsum were measured, and then the phosphogypsum was ground to a particle size of less than 3 to 5 mm using a ball mill; wherein the main chemical components of the phosphogypsum are SiO2, CaO and SO3, etc., and the particle size distribution is d10 = 3.52 μm, d30 = 18.14 μm, d50 = 42.93 μm, d60 = 45.97 μm, and Cu = 13.06.

[0066] (2) taking some granular APAM flocculants, adding deionized water and using a magnetic stirrer to prepare an APAM solution with a mass fraction of 0.5‰;

[0067] (3) adding calcium oxide and phosphogypsum in a certain proportion into a small thickening device and uniformly stirring, wherein the mass ratio of calcium oxide to phosphogypsum (dry weight) is 1:1, the uniform stirring time is not less than 10 minutes, and the rotation speed is not less than 200 r / min;

[0068] (4) adding a certain amount of APAM solution to accelerate the flocculation, sedimentation and concentration of phosphogypsum, and after standing for 5 to 10 minutes, using the overflow valve and the underflow discharge port to separate the supernatant from the high-concentration phosphogypsum;

[0069] (5) A certain mass of slag is added to high-concentration phosphogypsum, and clean water is added to prepare a homogeneous cemented filling body, wherein the mass ratio of slag to phosphogypsum (dry weight) is 1:6.

[0070] (6) Uniaxial compressive strength tests were performed on the test blocks at 3 days, 7 days and 28 days after the homogeneous cementitious filling slurry was molded. Three blocks were selected at each age and the average value was taken as the compressive strength of the test blocks at that age.

[0071] (7) The broken test pieces after the 28-day compressive strength test were processed to obtain the leachate, and the fluorine leaching amount of the phosphogypsum filling was measured.

[0072] Example 2: According to the steps described in Example 1, step (3) is modified to prepare a homogeneous cemented filling body with a mass ratio of calcium oxide to phosphogypsum (dry weight) of 1:2, and the other steps remain unchanged.

[0073] Example 3: According to the steps described in Example 1, step (5) is modified to prepare a homogeneous cemented filling body with a mass ratio of slag to phosphogypsum (dry weight) of 1:8, and the other steps remain unchanged.

[0074] Example 4: According to the steps described in Example 1, step (3) is modified to a mass ratio of calcium oxide to phosphogypsum (dry weight) of 1:2; step (5) is modified to a mass ratio of slag to phosphogypsum (dry weight) of 1:8 to prepare a homogeneous cemented filling body, and the other steps remain unchanged.

[0075] Comparative Example 1: According to the steps described in Example 1, step (5) is modified to a mass ratio of ordinary Portland cement to phosphogypsum (dry weight) of 1:8 to prepare a homogeneous cementitious filling body, and the other steps remain unchanged.

[0076] Comparative Example 2: A homogeneous cemented filling body is prepared according to the steps described in Example 1, except that step (3) the calcium oxide alkaline washing pretreatment step is omitted, and the other steps remain unchanged.

[0077] Comparative Example 3: According to the steps described in Example 1, the calcium oxide alkaline washing pretreatment step (3) is omitted, and step (5) is modified to a mass ratio of ordinary Portland cement to phosphogypsum (dry weight) of 1:8 to prepare a homogeneous cemented filling body, and the other steps remain unchanged.

[0078] The samples in the comparative examples and the embodiments were subjected to compressive strength tests at different ages and F leaching statistics at 28 days, and the results are as follows:

[0079]

[0080] From the above table, by comparing Examples 1-4 with Comparative Examples 1-3, it can be found that when the phosphogypsum is not pretreated with alkali washing and slag is used as the cementing material, the compressive strength of the filling body after 28 days is 0.76MPa, and the fluorine leaching amount is 14.6mg / L; under the same conditions, when ordinary Portland cement is used as the cementing material, the compressive strength of the filling body after 28 days is 0.86MPa, and the fluorine leaching amount is 10.5mg / L. When the phosphogypsum is pretreated with calcium oxide alkali washing and ordinary Portland cement is used as the cementing material, the compressive strength of the filling body after 28 days reaches 1.12MPa, and the compressive strength of the filling body of Examples 1-4 after 28 days reaches about 85% to 101% of that. This shows that the calcium oxide alkali washing pretreatment of phosphogypsum is not only an important factor in the increase of the strength of the filling body, but also the main source of reducing the amount of fluorine leaching. Therefore, under the condition of calcium oxide alkaline washing pretreatment, using slag as cementitious material can not only meet the strength requirements of goaf filling treatment, but also control the fluorine leaching amount within 3.0 mg / L, with significant economic and environmental benefits.

[0081] The uniaxial compressive strength of the all-solid waste filling body in Examples 1-4 is between 0.96 and 1.14 MPa, and the fluorine leaching amount is distributed between 1.69 and 1.92 mg / L, indicating that the homogeneous cemented filling bodies of the vegetation in the implementation cases of the present invention meet the strength requirements for underground goaf filling treatment, and also meet the Class I to III water standards specified in the groundwater quality standard (GB / T 14848-2017).

[0082] Example 6: Reference Figure 1-Figure 9 , a preparation device, which is used in the field of phosphogypsum filling, is used to prepare and test the compressive strength of the cemented filling body in the above-mentioned cemented filling method using calcium oxide pretreated phosphogypsum and slag. The specific implementation method is as follows:

[0083] Reference Figure 1 and Figure 2 The preparation equipment comprises a mixing box 1, a recovery box 2 is fixedly arranged below the mixing box 1, and the recovery box 2 is used to collect the supernatant after precipitation. A base 4 is arranged on one side of the mixing box 1, a fixed column 5 is fixed on the top of the base 4, and a rotating disk 6 is rotatably sleeved on the outer wall of the fixed column 5. A preparation box 3 is fixed on the top of the fixed column 5, and the preparation box 3 is used to mix high-concentration phosphogypsum with deionized water and slag to form a homogeneous cementitious filling slurry.

[0084] Reference Figure 2 and Figure 5 In the preparation box 3, a preparation cylinder 19 is provided, a pressure sensor 20 is fixed to the bottom of the preparation cylinder 19, and the pressure sensor 20 is fixedly embedded in the bottom inner wall of the preparation box 3. The pressure sensor 20 cooperates with the preparation cylinder 19 to weigh the mass of the high-concentration phosphogypsum, so that the amount of the high-concentration phosphogypsum used can be accurately controlled.

[0085] Reference Figure 2 , Figure 5 and Figure 6 A plurality of forming grooves 7 are arranged on the top of the rotating disk 6, and these forming grooves 7 are used to shape and solidify the homogeneous cementing filling slurry therein, thereby forming a high-strength, low-pollution cementing filling body. An impact block 39 is arranged below the preparation box 3 for testing the compressive strength of the cementing filling body.

[0086] Reference Figure 2 and Figure 5 In addition, the device also includes a second stirring shaft 21 that rotates and penetrates the preparation box 3. The bottom end of the second stirring shaft 21 rotates and extends into the preparation box 3 to stir the mixture of high-concentration phosphogypsum, deionized water and slag. A first cam 26 located above the preparation box 3 is fixedly sleeved on the outer wall of the second stirring shaft 21. The rotation of the first cam 26 can assist in stirring or pushing the material.

[0087] Reference Figure 2-Figure 5 In order to separate the supernatant from the high-concentration phosphogypsum, a separation structure is provided. The separation structure includes a fixed pipe 13 fixed on the top of the recovery box 2, and the bottom end of the fixed pipe 13 extends into the recovery box 2. A drain pipe 12 is slidably connected in the fixed pipe 13, and the top end of the drain pipe 12 is sealed and slidably extended into the mixing box 1. The outer wall of the fixed pipe 13 is provided with a thread, and the threaded sleeve is provided with a threaded sleeve 14, and the threaded sleeve 14 is rotatably provided on the outer wall of the drain pipe 12. By rotating the threaded sleeve 14, the lifting and lowering of the drain pipe 12 can be controlled.

[0088] Reference Figure 2-Figure 5 A first discharge pipe 16 is also fixed on the top of the recovery box 2, and the bottom end of the first discharge pipe 16 extends into the recovery box 2. A discharge barrel 15 is arranged on the top of the first discharge pipe 16, and the top end of the discharge barrel 15 is fixedly extended into the mixing box 1. An inclined screen plate 18 is slidably provided in the first discharge pipe 16, and the inclined screen plate 18 is used to filter high-concentration phosphogypsum. A guide pipe 8 is fixedly passed through one side of the first discharge pipe 16, one end of the guide pipe 8 is located above the inclined screen plate 18, and the other end is fixedly extended into the preparation box 3 and cooperates with the preparation barrel 19. An inclined baffle 17 is also fixed on one side of the first discharge pipe 16, and the inclined baffle 17 is located above the guide pipe 8 to prevent liquid from entering the preparation box 3 through the guide pipe 8. A first stirring shaft 9 is connected to the mixing box 1 in a longitudinally rotatable manner for stirring the mixed material.

[0089] When in use, the high-concentration phosphogypsum, deionized water and slag in the mixing box 1 are first stirred and mixed by the first stirring shaft 9. Then, the threaded sleeve 14 is rotated to lower the drain pipe 12, and the valve on the drain pipe 12 is opened to discharge the supernatant above the high-concentration phosphogypsum into the recovery box 2. Next, the valve on the drain pipe 12 is closed, the drain pipe 12 is raised, and the valve on the discharge barrel 15 is opened, and the high-concentration phosphogypsum in the mixing box 1 enters the first discharge pipe 16 through the discharge barrel 15. The high-concentration phosphogypsum is filtered when passing through the inclined screen plate 18, and the liquid therein is filtered out, while the high-concentration phosphogypsum enters the preparation barrel 19 through the guide pipe 8. At this time, the pressure sensor 20 can weigh the mass of the high-concentration phosphogypsum in the preparation barrel 19.

[0090] Reference Figure 5 and Figure 6 The preparation equipment also includes a filling structure, which includes a second discharge pipe 22 that slides through the inner wall of the bottom of the preparation box 3. The top of the second discharge pipe 22 is fixedly extended into the preparation tube 19 and is connected to the preparation tube 19. The second discharge pipe 22 is used to inject the cementing filling slurry into the forming groove 7. A gear ring 25 is fixed on the top of the rotating disk 6, and a driving motor 23 is fixed on one side of the fixed column 5. The output shaft of the driving motor 23 is fixed with a spur gear 24 that meshes with the gear ring 25. When the driving motor 23 is started, the rotating disk 6 can be driven to rotate through the meshing relationship between the spur gear 24 and the gear ring 25, so that the multiple forming grooves 7 are moved to the bottom of the second discharge pipe 22 in sequence.

[0091] Reference Figure 2 , Figure 6 and Fig. 9 Support columns 32 are fixed on both sides of the top of the base 4. The top of the support column 32 touches the bottom of the rotating disk 6 to support the rotating disk 6. A knocking cylinder 33 is slidably connected in the two support columns 32. The bottom of the knocking cylinder 33 is in a cone shape and is used to knock the rotating disk 6. A moving plate 31 is also slidably connected to the top of the base 4. One end of the moving plate 31 passes through the support column 32 and the fixed column 5 in sequence. A plurality of arc plates 34 are fixed on the top of the moving plate 31. When the moving plate 31 moves, the arc plates 34 drive the knocking cylinder 33 to move up, thereby causing the knocking cylinder 33 to knock the rotating disk 6.

[0092] Reference Figure 5 , Figure 7 and Figure 8A fixed seat 27 is fixed on the top of the preparation box 3, and an L-shaped rod 29 is slidably inserted in the fixed seat 27. The bottom end of the L-shaped rod 29 is fixedly connected to the top of one side of the moving plate 31. A push plate 28 is fixed on the side end of the L-shaped rod 29. The push plate 28 is slidably arranged on the top of the preparation box 3. A spring 30 is fixed between the push plate 28 and the fixed seat 27. The spring 30 is sleeved on the outer wall of the L-shaped rod 29. In addition, a first cam 26 is also fixed on the top of the preparation box 3. The first cam 26, the spring 30 and the push plate 28 cooperate to drive the push plate 28 to reciprocate. A plurality of second stoppers 44 for limiting the push plate 28 are also fixed on the top of the preparation box 3 to ensure the moving range of the push plate 28.

[0093] During the preparation process, first open the valve on the second discharge pipe 22, and the slurry in the preparation tube 19 will fall into the molding tank 7. Then, the motor drives the second stirring shaft 21 and the first cam 26 to rotate. The protruding part of the first cam 26 will cooperate with the spring 30 to drive the push plate 28, the L-shaped rod 29 and the moving plate 31 to move back and forth in a straight line. When the moving plate 31 drives the arc plate 34 to move, the arc plate 34 will cooperate with the knocking tube 33 to continuously knock the rotating disk 6, so that the slurry falling into the molding tank 7 is evenly distributed in the molding tank 7, which is convenient for the later compressive strength test. At the same time, by driving the motor 23, the spur gear 24 and the gear ring 25, the rotating disk 6 can be driven to rotate, thereby injecting slurry into multiple molding tanks 7.

[0094] Reference Figure 5-Figure 7 The test structure includes a lifting plate 37 slidably arranged on one side of the preparation box 3, and the bottom end of the lifting plate 37 is fixedly connected to the top of the impact block 39. The falling of the lifting plate 37 and the impact block 39 is used to knock the cementing filling body in the forming groove 7 to test its compressive strength.

[0095] Reference Figure 7 and Figure 8 The top of the preparation box 3 is slidably connected with an arc block 35, which cooperates with the first cam 26. The top of the arc block 35 is rotatably connected with a connecting rod 36 on one side of the lifting plate 37 through a hinge shaft. The cooperation between the arc block 35 and the connecting rod 36 is used to drive the lifting plate 37 to move upward. A plurality of placement boxes 38 are fixed on one side of the lifting plate 37 to control the force of the impact block 39 hitting the cementing filling body. The top of the preparation box 3 is also fixed with a first stopper 43 for limiting the arc block 35.

[0096] During the preparation process, the second stirring shaft 21 drives the first cam 26 to rotate. When the protruding part of the first cam 26 contacts the arc block 35, it pushes the arc block 35 to move outward. The arc block 35 drives the lifting plate 37 to move upward through the connecting rod 36, and then controls the impact block 39 to move up and down, which is used to impact the cementing filling body in the forming groove 7 to perform a compressive strength test. In addition, a corresponding load can be added to the placement box 38 to control the intensity of the impact.

[0097] Reference Figure 7 and Figure 8 The top of the preparation box 3 is also slidably connected with an arc baffle 40. A first clamping groove 41 is provided on the side of the arc block 35 close to the arc baffle 40, and a second clamping groove 42 is provided on the side of the push plate 28 close to the arc baffle 40. The two sides of the arc baffle 40 are respectively engaged with the first clamping groove 41 and the second clamping groove 42, so as to brake the arc block 35 and the push plate 28 respectively.

[0098] During the preparation process, when the first cam 26 rotates, its protruding portion will first contact the arc block 35, pushing the arc block 35 to move outward. At this time, the arc baffle 40 engages with the first slot 41 to brake the arc block 35, so that the lifting plate 37 remains in the upward state. When the first cam 26 continues to rotate and its protruding portion separates from the arc block 35, the arc block 35 will move downward under the gravity of the connecting rod 36 and the placement box 38, thereby driving the lifting plate 37 and the impact block 39 to fall and knock the cement filling body in the forming groove 7. Then, the protruding portion of the first cam 26 will contact the push plate 28, pushing the push plate 28 to move to one side. At this time, the arc baffle 40 engages with the second slot 42 to brake the push plate 28. When the first cam 26 continues to rotate and its protruding part separates from the push plate 28, the push plate 28 will reset under the elastic force of the spring 30, thereby driving the L-shaped rod 29, the moving plate 31 and the arc plate 34 to move, so that the knocking cylinder 33 knocks the rotating disk 6, so that the slurry is evenly distributed in the molding groove 7.

[0099] By braking the arc block 35 and the push plate 28 respectively by the arc baffle 40, the filling structure and the testing structure can be alternately driven to operate when the first cam 26 rotates, thereby realizing continuous preparation and testing.

[0100] Reference Figure 1 , Figure 2 and Figure 5The top of the mixing box 1 of the preparation equipment is designed with a hopper, which is used to inject raw materials such as phosphogypsum, water and other necessary additives into the mixing box 1. Similarly, a hopper is also provided on one side of the preparation box 3, which is used to inject the required raw materials into the preparation box 3. At the bottom of the mixing box 1, an inclined panel 11 is provided, which is fixed to the bottom inner wall of the mixing box 1. Its function is to transport the phosphogypsum particles deposited at the bottom of the mixing box 1 to the direction of the discharge barrel 15 to ensure that the phosphogypsum particles can be discharged smoothly. In addition, the outer walls of the second discharge pipe 22, the discharge pipe 12 and the discharge barrel 15 are all equipped with valves, which can control the opening and closing of the corresponding pipelines, thereby realizing precise control of the flow of materials. In order to facilitate the observation of the liquid level of the supernatant in the mixing box 1, a transparent glass 10 is specially provided on one side of the mixing box 1. The operator can visually view the liquid level of the supernatant through this transparent glass 10 to ensure the smooth progress of the preparation process.

[0101] Through the above implementation mode, the preparation equipment can efficiently and accurately prepare high-strength, low-pollution cemented filling bodies, and perform compressive strength tests to meet actual needs.

[0102] Example 7: Reference Fig.10 , improved on the basis of Example 1: inside the first discharge pipe 16, a rotating shaft 45 is designed to be rotatably connected. This rotating shaft 45 is located below the inclined screen plate 18, and a second cam 46 is provided on its outer wall fixed sleeve. The function of this second cam 46 is to continuously knock on the inclined screen plate 18 during rotation, thereby helping the high-concentration phosphogypsum on the inclined screen plate 18 to remove the contained moisture. One end of the rotating shaft 45 rotates and extends to one side of the first discharge pipe 16, and a second bevel gear 49 is fixed. In addition, a transmission shaft 47 is rotatably connected between the bottom of the mixing box 1 and the top of the recovery box 2, and the top end of the transmission shaft 47 is sealed and rotatably extends into the mixing box 1 and is fixedly connected to the bottom end of the first mixing shaft 9. Therefore, when the first mixing shaft 9 rotates, it will drive the transmission shaft 47 to rotate together. On the outer wall of the transmission shaft 47, a first bevel gear 48 meshing with the second bevel gear 49 is provided on the fixed sleeve. In this way, when the transmission shaft 47 rotates, the first bevel gear 48 and the second bevel gear 49 are meshed with each other, thereby driving the rotating shaft 45 and the second cam 46 to rotate.

[0103] In actual operation, when high-concentration phosphogypsum enters the first discharge pipe 16, the first stirring shaft 9 drives the transmission shaft 47 to rotate, and then drives the second cam 46 to rotate through the engagement of the first bevel gear 48 and the second bevel gear 49. The rotation of the second cam 46 continuously strikes the inclined screen plate 18, helping the high-concentration phosphogypsum on the inclined screen plate 18 to remove the contained moisture, thereby improving the preparation efficiency and quality of the phosphogypsum.

[0104] Through the above design, this preparation equipment not only realizes the precise control of the phosphogypsum preparation process, but also improves the preparation efficiency and quality of phosphogypsum through innovative mechanical structure, and has significant technical effects and practical application value.

[0105] A method for using a preparation device comprises the following steps:

[0106] S1, injecting a certain amount of APAM solution and phosphogypsum after the soluble F and P elements in the phosphogypsum are removed by calcium oxide alkaline washing pretreatment into the mixing box 1 through the feed hopper, and driving the first stirring shaft 9 by the motor to fully mix the solution and the phosphogypsum and then standing for 5 to 10 minutes, so that the APAM solution accelerates flocculation and sedimentation, and separates the supernatant and the high-concentration phosphogypsum;

[0107] S2. After observing the height of the supernatant and the high-concentration phosphogypsum in the mixing tank 1 through the transparent glass 10, the threaded sleeve 14 is rotated. The threaded connection between the threaded sleeve 14 and the fixed pipe 13 can control the lifting and lowering of the discharge pipe 12. The valve on the discharge pipe 12 is opened to quickly discharge the supernatant above the high-concentration phosphogypsum into the recovery tank 2. Then, the valve on the discharge barrel 15 is opened. The high-concentration phosphogypsum in the mixing tank 1 enters the first discharge pipe 16 through the discharge barrel 15, and the inclined sieve plate 18 filters the high-concentration phosphogypsum to filter the liquid contained therein, and the high-concentration phosphogypsum enters the preparation barrel 19 through the guide pipe 8;

[0108] S3. In addition, when the high-concentration phosphogypsum enters the first discharge pipe 16, the first stirring shaft 9 drives the transmission shaft 47 to rotate, and the transmission shaft 47 drives the second cam 46 to rotate through the meshing of the first bevel gear 48 and the second bevel gear 49. The second cam 46 can continuously knock the inclined screen plate 18 to remove the moisture contained in the high-concentration phosphogypsum on the inclined screen plate 18;

[0109] S4. When the high-concentration phosphogypsum enters the preparation tube 19, the pressure sensor 20 can detect the quality of the high-concentration phosphogypsum, and inject an appropriate amount of deionized water and slag into the preparation box 3 through the feed hopper as needed, and the motor drives the second stirring shaft 21 to rotate and stir evenly to prepare a homogeneous cementitious filling slurry;

[0110] S5, open the valve on the second discharge pipe 22, and the slurry in the preparation tube 19 falls into the molding groove 7, then the motor drives the second stirring shaft 21 and the first cam 26 to rotate, and the protruding part of the first cam 26 cooperates with the spring 30 to drive the push plate 28, the L-shaped rod 29 and the moving plate 31 to move back and forth linearly, and when the moving plate 31 drives the arc plate 34 to move, the arc plate 34 cooperates with the knocking tube 33 to continuously knock the rotating disk 6, so as to make the slurry falling into the molding groove 7 evenly distributed in the molding groove 7, which is convenient for the later compressive strength test. At the same time, the rotating disk 6 is driven to rotate by the cooperation of the driving motor 23, the spur gear 24 and the gear ring 25, so that the slurry can be injected into multiple molding grooves 7;

[0111] S6. When a compressive strength test is required, the push plate 28 is pushed outward until the push plate 28 touches the second stop block 44, pushing the arc baffle 40 to move, and the arc baffle 40 is clamped into the second clamping groove 42 to brake the push plate 28. After the arc block 35 loses the braking of the arc baffle 40, the arc block 35 is pushed to move to the middle under the gravity of the impact block 39 and the lifting plate 37. Thereafter, the second stirring shaft 21 drives the first cam 26 to rotate, and the first cam 26 pushes the arc block 35 to move outward. The arc block 35 drives the lifting plate 37 to move up through the connecting rod 36, thereby controlling the impact block 39 to move up and down, which is used to impact the cementing filling body in the forming groove 7 for testing its compressive strength test. In addition, corresponding weights can be added to the placement box 38 to control the intensity of the impact.

[0112] However, as is well known to those skilled in the art, the working principle and wiring method of the drive motor 23 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any selection according to their needs or convenience.

[0113] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cementing filling method using calcium oxide pretreated phosphogypsum and slag, characterized in that: The following steps are involved: S1. Select phosphogypsum after sufficient pressure filtration and test its moisture content, pH value and quality; S2, preparing APAM flocculant into a 0.5‰ solution; S3, mixing phosphogypsum and calcium oxide in a thickening device at a mass ratio of 1:1 to remove harmful components in the phosphogypsum; S4, adding APAM solution to the preparation equipment to accelerate flocculation and sedimentation and remove harmful components of phosphogypsum in step S3, and separating the supernatant and the high-concentration phosphogypsum; S5. In a preparation device, high-concentration phosphogypsum is mixed with deionized water and slag, and stirred evenly to prepare a homogeneous cementitious filling slurry; S6. Perform compressive strength test on the molded cemented filling body in the preparation equipment.

2. The cementing filling method using calcium oxide pretreated phosphogypsum and slag according to claim 1, characterized in that: The pH value of the phosphogypsum is 2-4, and the mass ratio of calcium oxide to phosphogypsum is 1:1-2.

3. The cementing filling method using calcium oxide pretreated phosphogypsum and slag according to claim 1, characterized in that: The calcium oxide alkali washing pretreatment time is at least 10 minutes, and the rotation speed is at least 200r / min; The mass ratio of the slag to the phosphogypsum is 1:6 to 1:8; The mass concentration of the homogeneous filling slurry is 64% to 68%, and the density is 2.2 to 2.5 g / cm 3 .

4. A preparation device for preparing a cemented filling body in the cemented filling method using calcium oxide pretreated phosphogypsum and slag as claimed in claim 1, characterized in that: It comprises a mixing box (1), a recovery box (2) is fixedly provided below the mixing box (1) for collecting the supernatant after precipitation, a base (4) is provided on one side of the mixing box (1), a fixed column (5) is fixed on the top of the base (4), a rotating disk (6) is rotatably sleeved on the outer wall of the fixed column (5), and a preparation box (3) is fixed on the top of the fixed column (5) for mixing high-concentration phosphogypsum with deionized water and slag to form a homogeneous cementitious filling slurry; It also includes a preparation tube (19) placed in the preparation box (3), a pressure sensor (20) is fixed to the bottom of the preparation tube (19), and the pressure sensor (20) is fixedly embedded in the bottom inner wall of the preparation box (3), and the pressure sensor (20) cooperates with the preparation tube (19) to weigh the mass of the high-concentration phosphogypsum; It also includes a plurality of molding grooves (7) arranged on the top of the rotating disk (6), which are used to mold and solidify the homogeneous cementing filling slurry in the molding grooves (7) to form a high-strength, low-pollution cementing filling body. An impact block (39) is provided below the preparation box (3) to test the compressive strength of the cementing filling body. It also includes a second stirring shaft (21) that rotates and penetrates the preparation box (3), the bottom end of the second stirring shaft (21) rotates and extends into the preparation box (3) to stir the high-concentration phosphogypsum mixed with deionized water and slag, and the outer wall of the second stirring shaft (21) is fixedly sleeved with a first cam (26) located above the preparation box (3); A separation structure is arranged between the mixing tank (1) and the recovery tank (2) and is used to separate the supernatant in the mixing tank (1) from the high-concentration phosphogypsum; The filling structure is arranged in the preparation box (3) and is used to uniformly fill the cementing filling slurry into the forming groove (7).

5. A preparation device according to claim 4, characterized in that: The separation structure comprises a fixed pipe (13) fixed on the top of the recovery box (2), and the bottom end of the fixed pipe (13) extends into the recovery box (2); a drain pipe (12) is slidably connected inside the fixed pipe (13), and the top end of the drain pipe (12) is sealed and slidably extended into the mixing box (1); the outer wall of the fixed pipe (13) is provided with a thread, and the outer wall of the fixed pipe (13) is threadedly sleeved with a threaded sleeve (14), and the threaded sleeve (14) is rotatably arranged on the outer wall of the drain pipe (12); the threaded sleeve (14) cooperates with the fixed pipe (13) to control the lifting and lowering of the drain pipe (12); a first discharge pipe (16) is fixed on the top of the recovery box (2), and the bottom end of the first discharge pipe (16) extends into the recovery box (2); the first discharge pipe (16) ) is provided with a discharge barrel (15) at the top, and the top end of the discharge barrel (15) is fixedly extended into the mixing box (1), an inclined screen plate (18) is slidably provided in the first discharge pipe (16) for filtering high-concentration phosphogypsum, a guide pipe (8) is fixedly passed through one side of the first discharge pipe (16), and one end of the guide pipe (8) is located above the inclined screen plate (18), the other end of the guide pipe (8) is fixedly extended into the preparation box (3) and cooperates with the preparation barrel (19), a sloped baffle (17) is fixedly provided on one side of the first discharge pipe (16), and the sloped baffle (17) is located above the guide pipe (8) for preventing liquid from entering the preparation box (3) through the guide pipe (8), and a first stirring shaft (9) is longitudinally rotatably connected in the mixing box (1).

6. A preparation device according to claim 5, characterized in that: The filling structure comprises a second discharge pipe (22) which slides through the inner wall of the bottom of the preparation box (3), the top end of the second discharge pipe (22) is fixedly extended into the preparation tube (19) and is connected to the preparation tube (19), and the second discharge pipe (22) is used to inject the cementing filling slurry into the forming groove (7), the top of the rotating disk (6) is fixed with a gear ring (25), one side of the fixed column (5) is fixed with a driving motor (23), and the output shaft of the driving motor (23) is fixed with a gear ring (25) which meshes with the gear ring (25). The spur gear (24) is used to drive the multiple forming grooves (7) to move sequentially to the bottom of the second discharge pipe (22). Support columns (32) are fixed on both sides of the top of the base (4), and the top of the support column (32) touches the bottom of the rotating disk (6) to support the rotating disk (6). The two support columns (32) are slidably connected with a knocking cylinder (33) for knocking the rotating disk (6). The top of the base (4) is slidably connected with a moving plate (31), and one end of the moving plate (31) is sequentially penetrated. The support column (32) and the fixed column (5) are passed through, a plurality of arc-shaped plates (34) are fixed on the top of the movable plate (31), the bottom of the knocking cylinder (33) is in a frustum shape, and the arc-shaped plates (34) are used to drive the knocking cylinder (33) to move upward, a fixed seat (27) is fixed on the top of the preparation box (3), an L-shaped rod (29) is slidably penetrated in the fixed seat (27), the bottom end of the L-shaped rod (29) is fixedly connected to the top of one side of the movable plate (31), and is used to drive the movable plate (31) to move, and the L-shaped rod A push plate (28) is fixed to the side end of the (29), and the push plate (28) is slidably arranged on the top of the preparation box (3), a spring (30) is fixed between the push plate (28) and the fixed seat (27), and the spring (30) is sleeved on the outer wall of the L-shaped rod (29) for resetting the push plate (28), the first cam (26), the spring (30) and the push plate (28) cooperate to drive the push plate (28) to reciprocate, and a plurality of second stoppers (44) for limiting the push plate (28) are fixed to the top of the preparation box (3).

7. A preparation device according to claim 6, characterized in that: The test structure is also included, which is arranged on one side of the preparation box (3) and is used to test the compressive strength of the cementing filling body in the forming groove (7). The test structure includes a lifting plate (37) which is slidably arranged on one side of the preparation box (3). The bottom end of the lifting plate (37) is fixedly connected to the top of the impact block (39). The lifting plate (37) and the impact block (39) fall downward to knock the cementing filling body in the forming groove (7). The top of the preparation box (3) is slidably connected to an arc block (35), and the arc block (35) ) cooperates with the first cam (26), the top of the arc block (35) and one side of the lifting plate (37) are rotatably connected to the same connecting rod (36) through a hinge shaft, the cooperation between the arc block (35) and the connecting rod (36) is used to drive the lifting plate (37) to move upward, a plurality of placement boxes (38) are fixed on one side of the lifting plate (37) for controlling the force of the impact block (39) striking the cementing filling body, and the top of the preparation box (3) is fixed with a first stopper (43) for limiting the arc block (35).

8. A preparation device according to claim 7, characterized in that: The top of the preparation box (3) is slidably connected with an arc-shaped baffle (40); a first clamping groove (41) is provided on a side of the arc-shaped block (35) close to the arc-shaped baffle (40); a second clamping groove (42) is provided on a side of the push plate (28) close to the arc-shaped baffle (40); and two sides of the arc-shaped baffle (40) are respectively engaged with the first clamping groove (41) and the second clamping groove (42) for braking the arc-shaped block (35) and the push plate (28) respectively.

9. A preparation device according to claim 8, characterized in that: A hopper for injecting raw materials is provided on the top of the mixing box (1) and one side of the preparation box (3); valves are provided on the outer walls of the second discharge pipe (22), the liquid discharge pipe (12) and the discharge barrel (15); an inclined panel (11) is fixed to the inner wall of the bottom of the mixing box (1) for conveying the precipitated phosphogypsum particles toward the discharge barrel (15); and a transparent glass (10) is provided on one side of the mixing box (1) for checking the liquid level of the supernatant.

10. A preparation device according to claim 5, characterized in that: A rotating shaft (45) located below the inclined screen plate (18) is rotatably connected inside the first discharge pipe (16), and a second cam (46) for driving the inclined screen plate (18) to move up and down is provided on the outer wall fixed sleeve of the rotating shaft (45), one end of the rotating shaft (45) is rotatably extended to one side of the first discharge pipe (16) and is fixed with a second bevel gear (49), a transmission shaft (47) is rotatably connected between the bottom of the mixing box (1) and the top of the recovery box (2), and the top end of the transmission shaft (47) is sealed and rotatably extended into the mixing box (1) and is fixedly connected to the bottom end of the first mixing shaft (9), and a first bevel gear (48) meshing with the second bevel gear (49) is provided on the outer wall fixed sleeve of the transmission shaft (47).

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